Move PathExists to base namespace.

chrome/installer/setup/install_worker.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file contains the definitions of the installer functions that build
 // the WorkItemList used to install the application.
 
 #include "chrome/installer/setup/install_worker.h"
 
 #include <oaidl.h>
@@ skipping 500 matching lines @@
     install_list->AddMoveTreeWorkItem(
         src_path.Append(installer::kWowHelperExe).value(),
         target_path.Append(installer::kWowHelperExe).value(),
         temp_path.value(),
         WorkItem::ALWAYS_MOVE);
   }
 
   // Install kVisualElementsManifest if it is present in |src_path|. No need to
   // make this a conditional work item as if the file is not there now, it will
   // never be.
-  if (file_util::PathExists(
+  if (base::PathExists(
           src_path.Append(installer::kVisualElementsManifest))) {
     install_list->AddMoveTreeWorkItem(
         src_path.Append(installer::kVisualElementsManifest).value(),
         target_path.Append(installer::kVisualElementsManifest).value(),
         temp_path.value(),
         WorkItem::ALWAYS_MOVE);
   } else {
     // We do not want to have an old VisualElementsManifest pointing to an old
     // version directory. Delete it as there wasn't a new one to replace it.
     install_list->AddDeleteTreeWorkItem(
@@ skipping 1180 matching lines @@
     if (installer_state.system_install())
       cmd_line.AppendSwitch(switches::kSystemLevel);
     AppCommand cmd(cmd_line.GetCommandLineString());
     cmd.set_sends_pings(true);
     cmd.set_is_web_accessible(true);
     cmd.AddWorkItems(installer_state.root_key(), cmd_key, work_item_list);
   }
 }
 
 }  // namespace installer